Keil is derived from Germanic origins. The name is of the meaning clumsy person. The name Keiler is a variant of Keil. Keil is rarely used as a baby name for boys.
Definition of flapjack for English Language Learners. : a thick, sweet cake made of oatmeal usually with molasses or honey.
As others have said, a pancake and a flapjack are the same thing in the US. If you are in the UK and refer to a flapjack, that is usually more like a bar type cookie made with oats.